How to classify Butterfly Valve

Butterfly valves can be classified in several ways based on design, connection type, actuation method, and pressure class. Here's a clear breakdown of butterfly valve:

1. By Body Design / Structure:

Wafer Type: Most common; sandwiched between two flanges.

Lug Type: Has threaded lugs for bolting; allows one-sided connection.

Flanged Type: Has flanged ends; easier to install and remove.

Butt-Welded Type: Welded directly into the pipeline; permanent connection.

2. By Disc Closure Design:

Concentric (Resilient-Seated): Stem is centered; used for low pressure.

Double Eccentric (High-Performance): Offset stem and disc; for higher pressure/temperature.

Triple Eccentric (Triple Offset): Advanced sealing; suitable for critical applications.

3. By Material:

Body/Disc Material: Cast iron, stainless steel, carbon steel, PVC, etc.

Seat Material: Rubber (EPDM, NBR), PTFE, metal (for high temp/pressure use).

4. By Actuation Method:

Manual: Handwheel or lever.

Electric: Electric motor for automated control.

Pneumatic: Air-powered for quick open/close.

Hydraulic: Fluid-powered for heavy-duty control.

5. By Application:

Industrial Water Supply

HVAC Systems

Chemical or Food Processing

Oil and Gas Pipelines